Todd Combs, who will take over stock-picking duties from Warren Buffett, joins investment bank as a director

J.P. Morgan Chase & Co. named one of Warren Buffett’s two stock pickers to its board, raising the executive’s profile and bringing the patina of Berkshire Hathaway Inc. to the bank.

Mr. Buffett hired Todd Combs in 2010 to be one of two investment managers who would eventually take over Berkshire’s gigantic stock portfolio as part of a succession plan. Since then, Mr. Combs has steadily expanded his role at the conglomerate.